Tsudo Compatible/Replacement for 2012-2015 Civic Si K24 Bellmouth Alfa Headers Downpipe Manufactured from T304 / SUS304 stainless steel for durability and high corrosion resistance CNC machine mandrel-bent stainless steel tubing for maximum exhaust flow Significant weight reduction compared to OEM exhaust system Improves horsepower, torque, throttle response, and fuel mileage Includes all necessary hardware (bolts and gaskets) for Bolt-on installation with typical hand tools